Reversible drill throttle



R; A. NCRLING navssrsma DRILL THROTTLE D'ec. 18, 1928.

2 Sheets-Sheet 1 Filed April 6. 1922 l II?, m.

Dec. 18, '1928.

R. A. NORLING REVERSEBLE DRILL THROTTLE Filed April 6, 1922 2 Sheets-Sheet 2 i w #im m i :ggg

Patented Dec. 18, 19728.

narran sTArns Parent ortica.

REINHOLD A. NORLING, OF AURORA, ILLINOIS, ASSIGNOR TO INDEPENDENT PNE- MATIG TOGL COMPANY, OF CHICAG-, ILLNOS, A COREll-A'Il OF EELAWARE.

REVERSIBLE DRILLy THROTTLE.

Application led April 6,

rllhis invention relates to reversible throttle valves for pneumatic tools and more particularly for pneumatic drills.r

@ne object of my invention is to maire the taper in the bore of the tubular valve member and vthe bearing surface' therefor on the stem relatively slight so that the end areas of the air passage chambers in the valve member re substantially the same and thus have very little back pressure on the valve member dur-` ing the flow of the air therethrough, and furthermore require the use of but a very light spring to hold the valve member on the taper and thus make the valve member turn freely and easily. y i

iinother object of my invention is to make this taper ust enoughy to take up'the wear between the parts and further to prevent the valve from sticking on the taper by means of an adjustable sleeve on the stem and bearing on that end of the valve member opposite the spring. y c

A further object of the invention is to provide'a safety loclr for the valve member while in position running the drill ortool forward and thus prevent the valve member being accidentally turned in position to reverse the drill. 1

further object of the invention is to improve the construction of reversible throttles as heretofore made by making the device more simple in construction and provide y itwith fewer and more substantial parts.

The invention consists further in the matters hereinafter described and more particularly set forth in the appended claims.

ln the accompanying` drawings- Y Fig. 1 is alongitudinal vertical sectiona View of a throttle valve mechanism constructed in accordance with my invention and talen approximately on line 1 1 of Fig. 5;

Fig. 2 is a transverse vertical sectional view taken on line 2 2 of Fig. 1,r and showing the outside valve member in the position indicated by the full lines in that ligure;

F ig. 3 is a similaiview of the same parts when the outside' valve has been turned into the position indicated by the dotted lines in Fig. 1; i Fig. l is a similar view of the same parts when the valve member is turned while the Y safety lock is on;

Fig. 5 is a top plan view of said throttle valve device with the drill casing in horizon` 1922. sei-iai no. 550,190.

tal section to show the air actuated pistons and their controlling valves; l

Fig. 6 is an elevational view of the throttle stem; l Y

Fig. 't' is a fragmentary longitudinal vert-ical sectional view of the safety lock;

Figs. 8 and 9 are transverse vertical seotional views taken on lines SW3 and 9-9,`re spectively, of Fig. 1, and f y Fig. 10 shows a detail of the safety locl.

ln the drawings, 1 indicates a drill casing, in which are housed and operate the pneumatically driven parts by kwhiehrotary motion is imparted to the spindle of the tool. in the form of drill shown, these parts includev air actuated pistons 2, 2 to whichA the supply offlive or compressed air is controlled by valves 3, 4, as illustrated in Fig. 5.

rlfhe drill casing 1 has two outwardly eirtending handles 5, 6 arranged on opposite sides thereof, as usualfin tools of this general character, and one of these handles,

namely the yone 5, is provided with thev throttle valve mechanism of my invention for controlling the supply of motive fluid to the drill and for reversing` the operationA or' the same.

The handle 5 comprises a stem 7 having its inner end secured in aboss 8 on the drill Ycasing by a clamp nut 9. it the outer end of the stem 7 is a nipple or cap' 10, by means of which an supply hose (not'shown) is attached to the handle 5. rlhe forward portion of said stem l is provided with a longitudinal air supply passage 11 opening atene end into the nipple 1() and at the other end into a cross-passage 12. rllhis is between the ends ofthe stem and opens outward through the same on'opposite sides thereof, as shown in Fig. 1. The portion of the stem between the cross-passage 12 and the drill casing 1 is provided with two longitudinal. air passages 13, 14 opening, respectively at their inner ends into the air chambers 15, 16 in the drill casing 1, as shown in Fig. 1. These chambers communicate with the cylinders of the pistons 2, 2 through the valves 3, 4f in accordance with the designxof drills of this kind. The outer ends of the passages 13, 14 open outward through the stem on opposite sides thereof adjacent the cross-passage 12 and are in the plane of the latter.

Communication between the crossfpassage 12 and the respective air passages 13, 14 is controlled by a` tubular throttle valve member 17 rotatively mounted on the exterior of the stem 7 over the cross-passage 12 and the adjacent ends of the passages 13, 14, as shown in Fig. 1. As there illustrated, the stem 7 has a slightly tapered portion 18 where the valve member 17 is mounted and the bore of said valve member has a complementary taper to lit the same on the stem. rlChis taper of the stein 7 extends beyond the bearing of the valve member 17 to the beginning of the external screw threads 19 on said stein 7, as shownin Figs. 1 and 6. rlhis is to allow the valve member 17 to move up on the taper 18 as the parts wear and thus insure a leak proof ioint between them at all times.

Surrounding the stein 7 on the threaded portion 19 is an internally threaded split sleeve 2O bearing against the opposed end of the valve member 17 and forii'iing an end thrust bearing therefor. For clamping the sleeve 2O on the threaded portion 19, there is a split clamp collar 21 surrounding the sleeve 20, as shown in Figs. 1 and 5. Said collar 21 has outwardly projecting ears or lugs 22, 22 at its split or severed ends to receive the clamp bolt 28. In assembling the parts, the valve member 17 is slipped over the outer end of the stein 7 and the valve and stein both being tapered, the valve is allowed to go up on the stem only so far, then the threaded sleeve 20 is screwed up against it and clamped in place by the collar 21. This will prevent the valve member 17 from inov`y ing any further on the taper and keep it from sticking on being turned.

Rotatably mounted on the portion of the stem 7 between the nipple 10 and valve meinber 17 is -a grip sleeve 24. This is provided at its inner end with two oppositely arranged tongues 25, 25 entering similarly arranged slots 26, 26 in the adjacent end of the valve member 17 so that the latter may be rotated by turning the grip sleeve 24. A coil spring 27- surrounds the stem, between the valve member 17 and the grip sleeve 24 to exert pressure on the valve member 17 in a ndirection to hold it up on the tapered portion 18 and against the sleeve 20. The valve meinber 17 and grip sleeve 24 are both counterbored out to receive the spring 27 and are provided with inwardly extending parts for the ends of the spring to engage, as shown in Figs. 1 and 7. Said spring 27 has a tendency to push the grip sleeve 24 away from the valve member 17, and to resist this the cap or nipple 10 has a shoulder 28 for the outer end of the grip sleeve to bear against, as shown in Fig. 1.

To prevent the valve member 17 from being accidentally turned to reverse the drill while running forward, l provide al safety loclr as follows.

The valve member 17 at its end adjacent the grip sleeve 24 is provided with an inwardly extending lrey 29 in the space between two radial stop shoulders 30, 30 on the stem 7, as shown in Figs. 1 to 4 and 6; Surrounding the valve member 17 at the key 29 is a ring 31 internally grooved to receive a flat split spring band 32. Said clip has a normal. diameter ,slightly less than the outside diameter of the valve member 17 where the clip tits about the saine, and when applied on the valve member must be expanded, thereby causing the clip to have a relatively tight grip on the valve member 17. With the clip located in the groove of the ring 31, the side portions of the ring are on opposite sides of the clip, and thus the ring is held from accidental lateral sliding movement on the valve member 17 by the clip. (See Fig. 10.) riClie grip of the clip or band 32 is not tight enough, however, to prevent the ring 31from being manually slid baclr and forth along the valve member when desired.' rlfhe ring 31 has a lug or pin 33 extending inwardly through the split in the clip 32 into an elongated slot 84 in the portion of the valve meinber 17 surrounded by said ring, as shown in Figs. 5 and 7. lNh-en the ring 31 is shifted laterally toward the inner end of the slot 34, the pin 33 is brought into the space between the shoulders 30, 30a and when shifted in the opposite direction the pin 33 is moved out of the space between saidv shoulders for the purpose to be presently described, the spring band 32 holding the ring in its positions of adjustment. i

The mechanism shown and described operates as follows. TWhen ruiming the drill in the reverse direction as when turning the drill spindle to the left, the valve member 17 is in the position shown in full lines in Figs. 1 and 2. In this position, the chamber 17 a of the valve member 17 connects the passages 11 and 13 together through the crosspassage 12 and supplies live air to the piston cylinders through the chamber 15 in the drill casing. The opposite chamber 17 b of the valve member 17 opens the outer end of the passage 14 to the atmosphere for the exhaust, and at `this side of the valve member there is a deflector flange 17 c extending toward the drill casing 1 to direct the exhaust away from the operator.

1n this position of the parts, the key 29 on the valve member 17 is against the shoulder 30, and the pin 38 on the ring 31 is out of the space between said shoulders to permit turning of the valve member to the full distance between the saine, as shown in 2.

In running the drill forward as when turnf ing the drill spindle to the right, the valve member 17 is turned by the grip sleeve 24 into a position to bringthe key 29 against the lshoulder 80a, as shown in Fig. 3. This Ulli brings another chamber 17 d ofthe valve mem ber 17 into the position shown in dotted lines A in Fig. 1 and connects the supply passage 11 with the vpassage 14 through the cross-passage 12, and the second Yexhaust ehamber17e3 of the valve'memberfover-fthe' outer end of the passage 13 to exhaust the same to vthe .at-y mosphere." The detleotor flange 17 C is then on top of the handle 'and directs the'eX haust toward'the drill and away from the operator. In this position of the parts, the

supply of air to vthe drill would be through the'passages 11,12, 14- and drillohamber 16, while the exhaust would be from the drill Chamber 15 through the passage 13.

After the valve member 17 Vhas beenturned to run the drill forward, the ring-31 is shifted 17 reaches reverse position and thus prevent reversing of the drill. ln this movement, however', the valve member 17 will be turned far enough to shut kolf the supply of air to the drill because neither of the y Chambers `17a or 17d arebrought into rregister with any of the handle passages.y

.llhe taper between the valve member 17 and.

stem 7 is very slight, about 1o on the side. This makes the end areas of the airpassage chambers of the valve member ysubstantially I the same kbecause ofthe slight difference between the ends of the taper,v with theresul't that there is very little back pressure on the valve member duringthe flow of air therethrough. Consequently, the lvalve rmember 17 turns freely and easily, and moreover a Y relatively light spring 27 is all that is required to'hold the valve member up on the taper. Moreover, the taper being slight prevents suoli differences in the end areas inthe valve chambers as to cause the valve member to be lifted off its through. y

The sleeve 2O being adjustable toward the valve member 17 prevents the latter from sticking on the taper, yet allowsit to Vcome up far enough on the same'to prevent leak ing. rlhe Clamp collar 21 is made separate from the sleeve 20 so that its lugsor ears' 29. may be always positioned not to strike the defleetor flange 17c in the turning of the valve member 17. Thus. when the sleeve 2 0 is adjusted, the lugs 22 may be positioned, asy

stated.

The spring band 32 makes an even `and smooth tension on the ring 31, and holds it in place, but moves smoothlyy without stieking and the bore of the ring and outside of the valve member 17 need not bev machined closely.

lWhile I have shown anddeseribed herein in detail a reversible throttle valve mecha-v nism of my invention, it is of course to be `seat by the airiiowingthereunderstood that the details ofk construction" andarrangement of parts may be variously `changed and modified without departing from the spirit and scope of my invention.

Iclairn as my invention: w 1. A reversible drill throttle, ooimprisingk a stem having aftapered portion between its ends andhaving supply and drill passages opening'outward through said taper, a tubular valve member with a tapered bore fitting the taper ofthe stem overfthe open ends-of said passages and havingiinlet and exhaust chambers for reversing the tlowof air through the drill passages on turning `thev'alve member, the taper of the stem and' that of the bore vbeing complementary 'and relatively slight so that the end areas of vsaid valve Chamberswill be substantially the same, 4a lrelatively light spring at `the smaller end'of the taper for holding the valve member up on the same, and an end thrust bearing for the valve member at the larger .endof thetaper.' l

J2. A reversible drill throttle, comprising a stem having a tapered portion between its ends and having supply and drilly passages opening outward through said taper, a tubular valve member with a' tapered bore'fittingthe taper of the stem over the open ends of said passages and having inlet and exhaust chambers for reversing4 *theV flow of air through the drill .passages von turning the valve member, the taper of the 'stem and that of the bore being complementary and relatively slight so that the end areas of said `valve chambers will be substantially the same, a relatively light spring at the smaller end of the taper'for holding'the valve member up on the same, and a sleeve adjustable on the stem at the larger end of the taper and forming an end thrust bearing for the valve member.` i v A3. A reversible drill throttle, Comprising a stem having a slightly tapered portion between its ends and having supply and drill passages opening outward through said taper, a tubular valve member with a slightly tapered bore'fitting the taper of the stein vover vthe open'ends of said. passages and havinginlet and exhaust Chambers for Vreverslngthe flow of air through the drill passages on turning' the valve member, a spring i at the smaller end of the taper for holding the valve member up onj the same, a sleeve adjustable on the stem at the larger end of the. taper and forming an end thrust bearing for the valve member, and a split clamp Collar-for the sleeve and extending about the same.

y4. A reversible drill throttle, comprising a stem having a tapered portion between its ends and having supply and drill passages opening outward through said taper, a tubular valve member with va tapered bore fitting the taper at the stem over the open ends of said passagesand having inlet and exhaust chambers for reversing the vflow of air through the drill passages on turning the valve member, the taper of the stem and that of the bore being complementary and relatively slight so that the end areas of said valve Chambers will be substantially the same, a relatively light spring at the smaller end of the taper for holding the valve member up on the same, an end thrust bearing for the valve member at the larger end of the taper, and a grip sleeve on the stem at the spring end thereof and engaged with the valve member for turning the same.

5. A reversible drill throttle, comprising a stem having a tapered portion between its ends and having supply and drill passages opening outward through said taper, a tubular valve member with a tapered bore it ting the taper of the stem over the open ends of said passages and having inlet and exhaust chambers for 1 reversing the ilow of air through the drill passages on turning the valve member, the taper of the stem` and that of the bore being complementary and relatively slight so that the end areas of said valve Chambers will be substantially the same, an end thrust bearing for the valve member at the larger end of the taper, a grip sleeve on the stem at the smaller end of the taper and having a tongue and slot connection with the valve member for turning the same, and a relatively light spring between the grip sleeve and valve member for holding the latter up onthe taper of the stem,

6. Av reversible drill throttle, comprising a stem with supply and drill passages opening outward through the stem between its ends, a tubular valve member on the stern over theopen ends of said passages and having inlet and exhaust chambers for reversing the flow of air through said drill passages on turning the valve member, and a safety lock embracing spaced shoulders on the stem and a pin carried by the valve member and mov able into the space between the shoulders for holding the valve member from heilig turned into reversing position when running the drill forward. e

T. A reversible drill throttle, Comprising a stem with supply and drill passages opening outward through the stem between its ends, a tubular valve member on the stem over the open ends of said passages and having inlet and exhaust Chambers for reversing the flow of air through said drill passages on turning the valve member, said stem vhaving spaced shoulders, and a key on the valve member and extending into the space between the shoul- Y ders to limit the extent of turning. of the valve member. t f

8. A reversible drill throttle, comprising a stem with supply and drill passages opening outward through the stem between its ends, a tubular valve member on the stem over the open ends ofsaid passages and having inlet and exhaust chambers for reversing the flow of air through said drill passages ony turning the valve member, said stem having circumferentially spaced shoulders, a ring slidable on the valve member and carrying a pin movable bythe ring into the space between shoulders on the stem to prevent turning ofthe valve member into reversing 'position while running the drill forward.

9. A reversible drill throttle, comprising a stem with supply and drill passages opening outward through the stem between its ends, a tubular valve vmember on the stem over the open ends of said passages and having inlet and exhaust chambers for reversing the flow of air through said drill passages on turning the valve member, said stem having spaced shoulders, a key on the valve member and extending into the space between the shoulders to limit the extent of turning of the valve member, and a ring slidable on the valve member and carrying a pin extending into the space between the shoulders through a slot in the valve member to prevent turning of the latter intovreversing position while running the drill forward. v

10. A reversible drill throttle, comprising a stem with supply and drill passages opening outward through the stem between its ends, a tubular valve member on the stem over the open ends of said passages and having inlet and exhaust chambers for reversing the flow of air through said drill passages on turning the valve member, aring slidable on lthe valve member and carrying a pin movable by the ring into the space between shoulA ders on the stem to prevent turning of the valve member into reversing position while running the drill forward, and a spring'band in an internal groove in said ring and frictionally engaging the valve member to hold the ring against accidental lateral movement thereon. f

In testimony that l claim thev foregoing as my invention, I aiiiX my signature, this 1st day of April, A. D. 1922.

REINHOLD A. NoRLnve. 

